Deezen is also a prolific voice actor, whose more notable characters include Mandark in the Cartoon Network series Dexter's Laboratory, Snipes the Magpie in Rock-a-Doodle, Ned in Kim Possible, and the Know-It-All Kid in The Polar Express.

[3][4][5][6] A class clown in his youth, Deezen aspired to become a stand-up comedian; he moved to Hollywood within days of graduating high school in order to pursue a comedy career.

By 1979, Deezen was in such demand that he was frequently obliged to decline some roles as he was already working: two such notable instances included the characters of Eaglebauer in Rock 'n' Roll High School and Spaz in Meatballs, both of which he turned down to appear in 1941.

[11] After WarGames wrapped, Deezen worked exclusively in independent film for the remainder of the 1980s, starting with his first starring role in the 1984 cult comedy Surf II: The End of the Trilogy, where he played the antagonist, mad scientist Menlo Schwartzer.

Deezen worked steadily throughout the remainder of the 1980s and early 1990s, continuing to play stereotypical "nerds" in both bit parts and major roles, including The Whoopee Boys (1986), the ensemble comedy Million Dollar Mystery (1987), Critters 2: The Main Course (1988), and The Silence of the Hams (1994).

He worked several times alongside comedian Tim Conway, most notably appearing in two of his Dorf videos, and struck up a partnership with low-budget filmmaker and producer Fred Olen Ray, who gave Deezen leading roles with the films Beverly Hills Vamp (1988), Mob Boss (1990), and Teenage Exorcist (1991).

[9] His early voice roles included Donnie Dodo in Sesame Street Presents: Follow That Bird (1985), and Snipes the Magpie in Don Bluth's 1991 film Rock-a-Doodle.

[14][15] Deezen eventually found full-time voice work on television in the mid-1990s, playing recurring characters on the animated series Grimmy, Duckman, Kim Possible and What's New, Scooby-Doo?, as well as guest spots on many others, including Johnny Bravo, Recess, and Darkwing Duck.

Deezen also voiced the character on the TV special Dexter's Laboratory: Ego Trip and the video games Cartoon Network Racing and FusionFall.

In 2004, Deezen supplied voice and motion capture performance for Robert Zemeckis' holiday film The Polar Express, playing the role of the nerdy "Know-It-All".

[19][20][21] While most of Deezen's articles focus on The Beatles and their members, he also writes about such subjects as baseball, American history and classic comedy acts like The Three Stooges, the Marx Brothers, and Martin and Lewis.

Deezen was eventually removed and detained in the Allegany County Jail to await a court appearance on charges of second degree assault, disorderly conduct and trespassing.